﻿using System;
using System.Net.Http;
using System.Text.Json;
using System.Threading.Tasks;
using Serilog;
using Wino.Core.Domain.Interfaces;
using Wino.Core.Domain.Models;
using Wino.Core.Domain.Models.AutoDiscovery;

namespace Wino.Core.Services;

/// <summary>
/// We have 2 methods to do auto discovery.
/// 1. Use https://emailsettings.firetrust.com/settings?q={address} API
/// 2. TODO: Thunderbird auto discovery file.
/// </summary>
public class AutoDiscoveryService : IAutoDiscoveryService
{
    private const string FiretrustURL = " https://emailsettings.firetrust.com/settings?q=";

    // TODO: Try Thunderbird Auto Discovery as second approach.

    public Task<AutoDiscoverySettings> GetAutoDiscoverySettings(AutoDiscoveryMinimalSettings autoDiscoveryMinimalSettings)
        => GetSettingsFromFiretrustAsync(autoDiscoveryMinimalSettings.Email);

    private static async Task<AutoDiscoverySettings> GetSettingsFromFiretrustAsync(string mailAddress)
    {
        using var client = new HttpClient();
        var response = await client.GetAsync($"{FiretrustURL}{mailAddress}");

        if (response.IsSuccessStatusCode)
            return await DeserializeFiretrustResponse(response);
        else
        {
            Log.Warning($"Firetrust AutoDiscovery failed. ({response.StatusCode})");

            return null;
        }
    }

    private static async Task<AutoDiscoverySettings> DeserializeFiretrustResponse(HttpResponseMessage response)
    {
        try
        {
            var content = await response.Content.ReadAsStringAsync();

            return JsonSerializer.Deserialize(content, DomainModelsJsonContext.Default.AutoDiscoverySettings);
        }
        catch (Exception ex)
        {
            Log.Error(ex, "Failed to deserialize Firetrust response.");
        }

        return null;
    }
}
